summer was obama's top national security -- why he says the u.s. doesn't need to cut a deal with hamid karzai of afghanistan. >>> next, how to understand the booming american economy. i'll ask the man who presided over great growth and some critics charge also helped create many bubbles. former fed chair, alan greenspan. >>> and as we approach the first anniversary of the new town massacre, what can the u.s. learn from other nations about gun policy. i'll take you to japan for a fascinating look at a nation that loves violent video games but has a gun death rate that is very different from america's. it's a preview of a gps special airing tonight at 7:00 p.m. eastern. >>> but first, here's my take. when nelson mandela was released from prison in 1990, i remember being struck by how old-fashioned he seemed. he spoke with the language cadence and manners from the 1930s, 40s and 1950s. he reminded me of the great national leaders of the post colonial world who led their countries to freedom. he had the same way of speaking and dressing, the same digni